Advantages of welding eccentric hemisphere valve
The advantages of welding eccentric hemisphere valves are as follows:
1、 Small pressure loss
When fully opened, the water loss is zero, the flow channel is unblocked, the valve core rotates 90 °, and the inner cavity of the valve body is automatically flushed, and the medium will not be deposited in the valve cavity. The sphere is hemispherical, and the flow has a very high CV value, which enhances the system effect of the pump and reduces the degree of wear and corrosion.
2、 Resistance to particle wear
The principle of double eccentricity is adopted. During the closing process, the ball crown slowly leans towards the valve seat only at the end, without friction; The sealing ring on the valve seat is welded with wear-resistant self-lubricating alloy, which is not easy to be worn and repaired; The ball crown of the knife shaped ball mouth and the valve seat have the function of cleaning and shearing, and are not easy to scale.
3、 Reliable automatic compensation seal
When positive pressure is applied, the principle of eccentricity is used to make the ball and valve seat closer and closer, so as to obtain a good seal; In any case, under the pressure, the floating valve seat automatically pushes the valve seat towards the ball. The higher the pressure, the tighter the valve seat towards the ball, so as to obtain a good seal; It can keep tight seal for a long time, and can adapt to harsh working conditions. Under long-term use, if the valve seat seal is worn or damaged, the valve seat will automatically push against the ball under the action of the spring, thus obtaining good automatic compensation function.
4、 Suitable for high velocity media
Because the sphere is hidden at one side of the valve chamber, a straight flow channel is formed without flow resistance. The solid eccentric fixed crankshaft has no vibration and noise in the medium with high flow rate.
5、 Long service life and easy switching
There are no vulnerable parts. Due to the effect of eccentricity, the sealing surface of the ball and the valve seat are completely separated during the opening and closing process of the valve, which makes the friction free rotation between the valve seat surface and the spherical crown surface, reducing the operating torque and making the operation light and convenient; The automatic compensation function of the valve greatly improves the service life of the valve.
